Dual-Sided LED Chip With Liquid Crystal Dimming Structure
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Solution Overview
Problem
Existing light-emitting diode (LED) chips emit light from both sides but lack individual control over light intensity from each side, limiting their application in display technologies where separate light sources are needed for normal display and supplemental lighting.
Innovation Solution
A light-emitting diode chip with a dimming structure that includes a liquid crystal layer and deflection electrodes between two substrates, allowing for independent adjustment of light intensity from one side by controlling liquid crystal molecules, enabling dual-sided emission with adjustable intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a double-sided LED chip is used to emit light from both sides, then the light emission capability is improved, but the ability to individually control light intensity from each side deteriorates
Solution Approach 1:
A liquid crystal layer is introduced as an intermediary substance between the LED chip and the upper substrate. This liquid crystal layer can be controlled to adjust its light transmission properties, thereby enabling independent control of light intensity from the upper side while maintaining full light emission from the lower side. The liquid crystal acts as a controllable mediator that selectively modulates light passage without affecting the LED's intrinsic dual-sided emission capability.
2Adaptability or versatility
If additional light sources are added for supplemental lighting, then the lighting functionality is improved, but the device complexity and cost increase
Solution Approach 1:
The liquid crystal layer serves multiple functions simultaneously: it acts as a dimming control mechanism for the upper light emission and as a supplemental lighting system. By controlling the liquid crystal's light transmission state, the same optical path can provide both normal display lighting and supplemental lighting functions, eliminating the need for separate additional light sources and reducing overall device complexity.
3Adaptability or versatility
If additional light sources are added for supplemental lighting, then the lighting functionality is improved, but the device volume increases
Solution Approach 1:
The supplemental lighting function is merged with the existing dual-sided LED chip structure. The liquid crystal layer, which is already part of the optical stack, is utilized to provide supplemental lighting by modulating light transmission. This merging of functions within the existing structural footprint avoids increasing device volume while still achieving enhanced lighting versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient use of light-emitting diode chips in display devices for both normal display and supplemental lighting without additional light sources, reducing costs and device volume by allowing individual control of light intensity from each side.
Implementation Method 1
deflection electrodes, located between the base substrate and the opposite substrate, configured to control liquid crystal molecules in the liquid crystal layer to be deflected
Implementation Method 2
the dimming structure is configured to adjust an intensity of light emitted from the side of the base substrate away from the light-emitting diode
Data Source
AI summary
This disclosure discloses a light-emitting diode chip, a method for fabricating the same, a backlight module, and a display device. The light-emitting diode chip includes: a transparent base substrate; at least one light-emitting diode located on one side of the base substrate; and a dimming structure located on a side of the base substrate away from the light-emitting diode, wherein the light-emitting diode is configured to emit light from double sides thereof; and the dimming structure is configured to adjust the intensity of light emitted from the side of the base substrate away from the light-emitting diode.